No encontré una buena respuesta a mi pregunta, lo que tenía que hacer era escribir una nueva clase Principal que escaneara el directorio para todos los grupos a los que pertenece el usuario, y escanear recursivamente todos los grupos para resolver grupos membresías grupales. Código provisto para usuarios con el mismo problema. No es el código más curioso que he escrito, pero al menos funciona.
uso como esto:
var wp = new WindowsPrincipalEx(WindowsIdentity.GetCurrent());
result = wp.IsInRole(@"domain\role");
public class WindowsPrincipalEx : IPrincipal
{
// Dictionary to store all groups, key = uppercase groupname, value = groupname as entered in AD
private Dictionary<string,string> completeGroupList = new Dictionary<string,string>();
// Private vars
private WindowsIdentity identity;
private string domain;
// Identity property
public IIdentity Identity
{
get { return identity; }
}
// Constructor, accepts identity
public WindowsPrincipalEx(IIdentity identity)
{
this.identity = (WindowsIdentity)identity;
// Find domain name and store it for filtering purposes
if (identity.Name.Contains('\\'))
this.domain = identity.Name.Substring(0, identity.Name.IndexOf('\\') + 1);
// Find all groups this user belongs to, and store the list for later use
getRoles(completeGroupList);
}
public bool IsInRole(string role)
{
// Remove domain
if (role.StartsWith(domain, StringComparison.CurrentCultureIgnoreCase))
role = role.Substring(domain.Length);
return completeGroupList.ContainsKey(role.ToUpper());
}
private void getRoles(Dictionary<string,string> groupList)
{
// Find username and remove domain
string name = Identity.Name.Replace(domain,"");
// Find user in AD
DirectorySearcher search = new DirectorySearcher("(&(sAMAccountName="+name+")(objectCategory=user))");
search.PropertiesToLoad.Add("memberof");
SearchResult result = search.FindOne();
if (result != null)
{
// Add all groups to the groupList dictionary
foreach (string s in result.Properties["memberOf"])
{
string[] elements = s.Split(new char[] { ',' });
foreach (string e in elements)
if (e.StartsWith("CN=", StringComparison.CurrentCultureIgnoreCase))
{
if (!groupList.ContainsKey(e.Substring(3).ToUpper()))
groupList.Add(e.Substring(3).ToUpper(),e.Substring(3));
break;
}
}
}
// Scan through all groups found, and find group on group memberships recursevly
foreach (var ng in groupList.ToArray())
getRolesInRoles(groupList, ng.Key);
}
private void getRolesInRoles(Dictionary<string, string> groupList, string roleName)
{
string name = roleName.Replace(domain, "");
// Find group in AD
DirectorySearcher search = new DirectorySearcher("(&(cn="+name+")(objectCategory=group))");
search.PropertiesToLoad.Add("memberof");
SearchResult result = search.FindOne();
if (result != null)
{
// Add all groups to the groupList dictionary
foreach (string s in result.Properties["memberOf"])
{
string[] elements = s.Split(new char[] { ',' });
foreach (string e in elements)
if (e.StartsWith("CN=", StringComparison.CurrentCultureIgnoreCase))
{
if (!groupList.ContainsKey(e.Substring(3).ToUpper()))
{
groupList.Add(e.Substring(3).ToUpper(),e.Substring(3));
getRolesInRoles(groupList, e.Substring(3));
}
break;
}
}
}
}
}